Fuel mixing device



Aug. 6, 1940. F. KO CH FUEL MIXING DEVICE Filed March 10, 1939 INVENTOR ATTORNEYS Patented Aug. 6, 1940 UNITED STATES FUEL MIXING DEVICE Fredrick Koch, Detroit, Mich.

Application March 10,

2 Claims.

My invention relates to internal combustion engines, and has among its objects and advantages the provision of an improved fuel mixer.

An object of my invention is to provide novel means for introducing additional air into the fuel mixture produced by the carburetor of the engine. I provide means for introducing a constant but variable supply of air to the carburetor mixture, in addition to providing novel means for introducing a supplementary volume of air in proportion to the extent to which the throttle valve is opened. The supplementary airintroducing means are operatively associated with the throttle valve so as to be simultaneously actuated therewith through operation of the throttle valve.

In the accompanying drawing:

Figure 1 is a sectional view of the conduit between the carburetor and the intake manifold of the engine illustrating my invention incorporated therein;

Figure 2 is a sectional view taken substantially along the line 2--2 of Figure 1;

Figure 3 is a sectional View taken substantially along the line 3-3 of Figure 1; and

Figure 4 is a detail view illustrating the manner in which the invention is operatively connected with the throttle Valve control.

In the embodiment selected to illustrate my invention, the carburetor is indicated generally at In and includes the usual conduit 12 for connection with the intake manifold of the engine. Conduit l2 includes conventional sections l4 and I6 which are flanged at 18 and 20, respectively. In the instant case, sections l4 and I6 are separated sufiiciently far to accommodate the mixing unit 22, and the parts are connected into a unitary structure by bolts 24 in the manner of the original connections between the sections l4 and I6.

Unit 22 includes a frame 26 having its outer face 28 contoured to correspond to the outer faces 30 of the flanges I8 and 20, with the frame 26 clamped between the two flanges. I fashion the frame to provide an annular flange 32 which fits snugly inside the section l4, and the frame is provided with an annular groove 34 located so as to provide a wall 36 lending continuity to the conduit defined by the sections I4 and I6. Wall 36 terminates slightly short of the face 38 of the frame 26 to provide accommodation for a flange 40 associated with a ring 42 fitting snugly inside the section [6, with the inner face of the ring lying substantially flush with the inner face of the wall 36 and the flange 32.

Flange 32 includes a bar 44 provided with a 1939, Serial No. 261,080

socket 46 for supporting a roller bearing 48 which supports one end of a shaft 50 to which 1 key a fan 52. The upper end of the shaft 50 lies in a socket 54 carried by a bar 56 formed integrally with the ring 42. I prefer to interpose a roller bearing 58 between the upper end of the shaft 56 and the bottom of the bearing socket 54. To the shaft 50, between the fan 52 and the bar 56, I fixedly connect an arm 60 provided with a plurality of transverse perforations 62 and arranged at a slight angle to the plane of the fan 52, as illustrated in Figure 1.

Wall 36 is provided with a plurality of ports 63 which establish communication between the annular groove 34 and the conduit defined by the sections I4 and I6. I provide the frame 26 with a valve plate 64 pivotally mounted along its upper horizontal edge on a shaft 66. Plate valve 64 is located inside a passage 68 in the frame 26, which passage establishes communication between the annular groove 34 and the atmosphere, assuming that the plate valve 64 is opened.

Diametrically opposite the passage 68 and in the frame 26 I provide a second passage 10 for establishing communication between the annular groove 34 and the atmosphere. I provide the frame with an extension 12 provided with a bore 14 within which I mount a rotary valve 76 slabbed off at 18 so as to open the passage 10 when posisioned according to Figure 1. Extension 12 is provided with a slot 80 constituting a continuation of the passage 70. Rotary valve 16 may be adjusted to different positions for variably restricting communication between the annular groove 34 and the atmosphere.

Figure 2 illustrates the specific construction of the rotary valve 16, which valve includes a bearing reach 82 rotatably supported inside one end of the bore 14. The opposite end of the rotary valve includes a bearing reach 84 rotatably supported in the opposite end of the bore. A smaller bore 86 accommodates the short shaft part 68 of the rotary valve, which shaft part is provided with a threaded opening for the reception of a screw 90, the head of which engages the face 92 of the extension 12. Thus the head of the screw and the end 94 of the rotary valve cooperate to restrain the rotary valve from relative longitudinal shifting inside the bore 14.

To the end 96 of the rotary valve I fixedly connect one end of an arm 98, the other end of which is pivotally connected with one end of a link 100 having its opposite end pivotally connected with an arm I02 fixedly related to the shaft [M which carries the throttle valve I06. Shaft I04 is provided with the usual arm [08 having its outer end loosely connected with a control rod H through the medium of which the throttle valve I06 is adjusted.

In operation, the control illustrated in Figure 4 is such that the rotary valve 16 closes the passage Hi When the valve N35 is in its idling position. As the throttle valve I06 is progressively movedto an open position, the control mechanism oflFigure 4 opens the rotary valve 16 in corresponding degrees. Irrespective of the rotary valve 16 the plate valve 64 operates automatically to admit air to the conduit l2. The amount admitted depends upon the degree of suction in the conduit l2. Fan 52 lies in the plane of the ports 63, and the fan has its blades angled in such fashion as to impart rapid rotation thereto in response to the passage of the fuel mixture through the conduit. Fan 52 will be rotated at a rapid rate, and the perforated arm 66 will cooperate with the fan to effectively mix the supplementaryair with the carburetor mixture. As the throttle valve N16 is moved toward its open position, rotary valve 16 is automatically opened in proportional degree so as to admit additional air to the carburetor mixture, thus supplementing the automatic plate valve 64.

Without further elaboration, the foregoing will so fully illustrate my invention that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

1. In a carbureted fuel conduit of an internal combustion engine, a rotary mixing element in said conduit mounted for rotation about the axis of the conduit and being rotatably responsive to the fuel mixture passing therethrough, said conduit having an air passage extending circumferentially thereabout, the wall of the conduit being provided with air ports located in the plane of said rotary mixing element for the admission of air to the conduit and for delivery to the rotary mixing element to be mixed with the fuel mixture in the conduit, a suction responsive air control valve communicating with said air passage, and a manually controlled air inlet valve for said air passage.

2. In a carbureted fuel conduit of an internal combustion engine, a rotary mixing element in said conduit mounted for rotation about the axis of the conduit and being rotatably responsive to the fuel mixture passing therethrough, said conduit having an air passage extending circumferentially thereabout, the wall of the conduit being provided with air ports located in the plane of said rotary mixing element for the admission of air to the conduit and for delivery to the r0- tary mixing element to be mixed with the fuel mixture in the conduit, and a perforated arm fixed to the fan for rotation therewith and extending generally transversely of said conduit. FREDRICK KOCH. 

